Photo #: ISS005-E-20451 Date: Nov. 2002Geographic Region: CHAD
Feature: EMI KOUSSI, CRATER DETAIL
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Photo #: ISS005-E-20451 Date: Nov. 2002 Geographic Region: CHAD Feature: EMI KOUSSI, CRATER DETAIL |
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| Emi Koussi is a high volcano that lies at the south end of the Tibesti Mountains in the central Sahara in northern Chad. The volcano is one of several in the Tibesti massif, and reaches 3415 m in altitude, rising 2.3 km above the surrounding sandstone plains. The volcano is 65 km wide. This view of the Emi Koussi caldera was taken with an 800 mm lens on November 11, 2002. It is detailed to the point that it doesn't include the entire 10-km diameter of the caldera, but reveals individual lava strata within the walls of the summit cliffs. Nested within the main caldera is a smaller crater that contains white salts of a dry lake at its lowest point. Here too, strata are visible in the walls of the smaller crater. The smaller crater is surrounded by a region of darker rocks--a geologically young dome of lava studded with several small circular volcanic vents. Emi Koussi has been used as a close analog to the famous Martian volcano Elysium Mons (//www.msss.com/mars_images/moc/7_10_98_elysium_rel/). One of the most important morphological differences between volcanoes on Mars and Earth is the widespread furrowing of the surface due to flowing water on terrestrial volcanoes. The furrows are shallow valleys. Larger channels have a different origin. Major channels can be seen on volcanoes on both planets and indicate low points in caldera rims where lava spilled out of pre-collapse craters. |
| Images: | All Available Images Low-Resolution 72k |
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| Mission: | ISS005 |
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| Roll - Frame: | E - 20451 |
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| Geographical Name: | CHAD |
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| Features: | EMI KOUSSI, CRATER DETAIL |
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| Center Lat x Lon: | 20.0N x 18.5E |
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| Film Exposure: | N=Normal exposure, U=Under exposed, O=Over exposed, F=out of Focus |
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| Percentage of Cloud Cover-CLDP: | 0 |
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| Camera:: | E4 |
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| Camera Tilt: | 31 | LO=Low Oblique, HO=High Oblique, NV=Near Vertical |
| Camera Focal Length: | 800 |
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| Nadir to Photo Center Direction: | W | The direction from the nadir to the center point, N=North, S=South, E=East, W=West |
| Stereo?: | Y=Yes there is an adjacent picture of the same area, N=No there isn't |
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| Orbit Number: | 2702 |
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| Date: | 20021111 | YYYYMMDD |
| Time: | 082600 | GMT HHMMSS |
| Nadir Lat: | 20.0N |
Latitude of suborbital point of spacecraft |
| Nadir Lon: | 20.6E |
Longitude of suborbital point of spacecraft |
| Sun Azimuth: | 141 | Clockwise angle in degrees from north to the sun measured at the nadir point |
| Space Craft Altitude: | 206 | nautical miles |
| Sun Elevation: | 43 | Angle in degrees between the horizon and the sun, measured at the nadir point |
| Land Views: | CALDERA, CRATER, VOLCANO |
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Photo is not associated with any sequences | ||
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